op {
  name: "OptionalFromValue"
  input_arg {
    name: "components"
    type_list_attr: "Toutput_types"
  }
  output_arg {
    name: "optional"
    type: DT_VARIANT
  }
  attr {
    name: "Toutput_types"
    type: "list(type)"
    has_minimum: true
    minimum: 1
  }
}
